When does autumn start and end?

Answer

In the Northern Hemisphere, autumn is between the autumnal equinox that begins on Sept. 22 or 23 and the winter solstice, which is Dec. 21 or 22. In the Southern Hemisphere, autumn is between March 20 or 21 and June 21 or 22.

The temperature transition in autumn from summer heat to winter cold only occurs in middle and high latitudes. In equatorial regions, temperatures usually have very little variation during the year. In polar regions, autumn is very short. In the central and eastern United States and Europe, a relatively common autumn phenomenon is an Indian summer, which is a period of unseasonably warm weather that sometimes continues until late October or November.

Reference:
Q&A Related to "When does autumn start and end?"
When autumn begins depends on where you are in relation to the equator. Generally, in the United States it begins around the 21st of September each year.
http://www.ask.com/web-answers/Society/Other/when_...
suprisingly they say it ends on 21st December, weird, it feels like winter then.
http://wiki.answers.com/Q/When_does_autumn_end
In the US, autumn 2011 begins on September 23rd and ends on Tuesday, 31st May 2011.
http://www.kgbanswers.com/when-does-autumn-start-a...
September 22 to December 20
http://answers.yahoo.com/question/index?qid=200911...
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The British autumn usually starts in March and ends in October. This is usually called the summer time, and autumn is said to approximately start on the 21st of ...
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